Here's a breakdown:
* சம (Sama): means "even" or "flat"
* வெளி (Veli): means "field" or "open space"
Therefore, "சமவெளி" literally translates to "even field" or "flat open space," which accurately describes a plain.
You can also use other words like "பள்ளத்தாக்கு" (Pallatthaaku) for a valley or "வயல்" (Vayal) for a field, depending on the specific context.